diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index c47346a4bf21a3c11bfb56b3d0aae36c622b2026..2c6417c65a7b0703b5abc1858316c13b1ad2f023 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -109,6 +109,11 @@ class RoomVersions(object):
     STATE_V2_TEST = "state-v2-test"
 
 
+class RoomDisposition(object):
+    STABLE = "stable",
+    UNSTABLE = "unstable"
+
+
 # the version we will give rooms which are created on this server
 DEFAULT_ROOM_VERSION = RoomVersions.V1